Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    10-09-2024 10:10

General

  • Target

    9622f580ee393bcb238cbbcdbf4752acac3ea2f538139352845952a4dea884f1.exe

  • Size

    228KB

  • MD5

    1a09089eb2bf1f7ac14b32335533b7af

  • SHA1

    7e08605a4e6d4b4ac6c5ec20ff5eba2884dd1db8

  • SHA256

    9622f580ee393bcb238cbbcdbf4752acac3ea2f538139352845952a4dea884f1

  • SHA512

    6202be3984d1dfd356f89921b4a62b2e91d7139627fe0da4e60f878e7fd17f6b35bd5e118464b25f0e4de4dd545825dbcbbcf24401853645d51665b37eaf9da3

  • SSDEEP

    3072:lN67vpI29VaPzK76NcNXLvoaedUE7nuQTdzZ/p43s64ctjm4f:lN67vpIKVozf0XLuuQTdJ2Nd

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Program crash 2 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies data under HKEY_USERS 5 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9622f580ee393bcb238cbbcdbf4752acac3ea2f538139352845952a4dea884f1.exe
    "C:\Users\Admin\AppData\Local\Temp\9622f580ee393bcb238cbbcdbf4752acac3ea2f538139352845952a4dea884f1.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:328
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tgbtzkjg\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4940
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pbresrjn.exe" C:\Windows\SysWOW64\tgbtzkjg\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3632
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create tgbtzkjg binPath= "C:\Windows\SysWOW64\tgbtzkjg\pbresrjn.exe /d\"C:\Users\Admin\AppData\Local\Temp\9622f580ee393bcb238cbbcdbf4752acac3ea2f538139352845952a4dea884f1.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4440
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description tgbtzkjg "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2036
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start tgbtzkjg
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:248
    • C:\Windows\SysWOW64\netsh.exe
      "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
      2⤵
      • Modifies Windows Firewall
      • Event Triggered Execution: Netsh Helper DLL
      • System Location Discovery: System Language Discovery
      PID:5052
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 328 -s 1096
      2⤵
      • Program crash
      PID:2588
  • C:\Windows\SysWOW64\tgbtzkjg\pbresrjn.exe
    C:\Windows\SysWOW64\tgbtzkjg\pbresrjn.exe /d"C:\Users\Admin\AppData\Local\Temp\9622f580ee393bcb238cbbcdbf4752acac3ea2f538139352845952a4dea884f1.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:356
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:3884
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 356 -s 536
      2⤵
      • Program crash
      PID:3136
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 328 -ip 328
    1⤵
      PID:1688
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 356 -ip 356
      1⤵
        PID:1728

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\pbresrjn.exe

        Filesize

        11.8MB

        MD5

        1e879a83514de1fcf1b6f3d2cc967be8

        SHA1

        7039c4bc99de9630da2945c4895b08b05876c180

        SHA256

        b11b61f0ed3f0bbe7ccc22920aed4ae7b44d6f09864e6c6f761c183cb0d26483

        SHA512

        4284ff4ce51ca97c2968d0bdc6e5ea06461980453fde27cfbe5a20772a85d35c995f2e09a067e56d161ccb65e81ee3a86387ae19f1abc7034401b296f0cdacbb

      • memory/328-2-0x00000000049A0000-0x00000000049B3000-memory.dmp

        Filesize

        76KB

      • memory/328-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/328-8-0x00000000049A0000-0x00000000049B3000-memory.dmp

        Filesize

        76KB

      • memory/328-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/328-7-0x0000000000400000-0x0000000002B59000-memory.dmp

        Filesize

        39.3MB

      • memory/328-1-0x0000000002E70000-0x0000000002F70000-memory.dmp

        Filesize

        1024KB

      • memory/356-15-0x0000000000400000-0x0000000002B59000-memory.dmp

        Filesize

        39.3MB

      • memory/3884-41-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-36-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-13-0x0000000000F00000-0x0000000000F15000-memory.dmp

        Filesize

        84KB

      • memory/3884-31-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-52-0x00000000025E0000-0x00000000025E7000-memory.dmp

        Filesize

        28KB

      • memory/3884-48-0x0000000007D00000-0x000000000810B000-memory.dmp

        Filesize

        4.0MB

      • memory/3884-47-0x00000000025D0000-0x00000000025D5000-memory.dmp

        Filesize

        20KB

      • memory/3884-44-0x00000000025D0000-0x00000000025D5000-memory.dmp

        Filesize

        20KB

      • memory/3884-43-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-42-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-11-0x0000000000F00000-0x0000000000F15000-memory.dmp

        Filesize

        84KB

      • memory/3884-40-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-39-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-38-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-37-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-14-0x0000000000F00000-0x0000000000F15000-memory.dmp

        Filesize

        84KB

      • memory/3884-35-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-34-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-33-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-32-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-30-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-29-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-28-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-27-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-24-0x00000000025C0000-0x00000000025D0000-memory.dmp

        Filesize

        64KB

      • memory/3884-20-0x0000000002D00000-0x0000000002F0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3884-18-0x0000000002D00000-0x0000000002F0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3884-21-0x00000000021F0000-0x00000000021F6000-memory.dmp

        Filesize

        24KB

      • memory/3884-51-0x0000000007D00000-0x000000000810B000-memory.dmp

        Filesize

        4.0MB